A London Telecommunications Region film showing the transfer of Upminster Exchange, the last CB1 manual exchange in the London telephone Region to Crossbar (Plessey 5005) automatic: the first to be installed in the LTR and the cut over on December 3rd 1970. Shots of CB1 in action, of the new crossbar and the changeover ceremony.
Video Datum: 1970 Bildquelle: (c) BT Image Library
